可编程控制器-第2部分:设备要求和测试SUL 61131-21.1范围和目标IEC 61131的这一部分规定了可编程控制器（PLC）及其相关外围设备（例如，编程和调试工具（PADT）、人机接口（HMI）的要求和相关测试，其预期用途是控制和指挥机器和工业过程。PLC及其相关外围设备拟用于工业环境，可作为开放式或封闭式设备提供。如果PLC或其相关外围设备拟用于其他环境，则这些其他环境的特定要求、标准和安装实践必须另外应用于PLC及其相关外围设备。本标准也适用于执行PLC和/或其相关外围设备功能的任何产品。 本标准涵盖的设备拟用于低压装置中的II类过电压（IEC 60664-1），其中额定电源电压不超过交流1000 V r.m.s.（50/60 Hz），或直流1 500 V（如果PLC或其相关外围设备用于过电压III类安装，则需要进行额外分析，以确定设备是否适合这些应用。）1.1DV对1.1第4段的修改:根据国家电气规范的要求，工作电压超过600 V的设备被视为高压设备。本标准不涉及整个自动化系统的功能安全或其他方面。PLC及其应用程序和相关外围设备被视为控制系统的组成部分。由于PLC是组件设备，整个自动化系统（包括安装和应用）的安全考虑超出了本标准的范围。 然而，涉及电击和火灾危险、电气干扰抗扰度和PLC系统操作的错误检测（如奇偶校验、自检诊断等的使用）的PLC安全性得到了解决。有关电气安装和指南，请参考IEC 60364或适用的国家/地方法规。本标准的目的是——确定与PLC及其相关外围设备的选择和应用相关的定义和主要特征；-规定适用于PLC和相关外围设备的功能、电气、机械、环境和结构特征、使用条件、安全、EMC、用户编程和测试的最低要求。本部分还规定了a）PLC及其相关外围设备的服务、储存和运输要求（第4条）； b） PLC及其相关外围设备的功能要求（第5条）；c） PLC及其相关外围设备的EMC要求（第8条）；d） PLC及其相关外围设备的安全要求（第11条）；e） 要求制造商提供的信息（第7、10和14条）；f） 用于验证PLC及其相关外围设备是否符合要求的试验方法和程序（第6、9和12条）。这些测试是型式测试或生产例行测试，而不是与PLC系统应用方式相关的测试。 1.101DV在1.1中增加了以下内容:本设备旨在根据国家电气规范（NEC）进行安装，以便在普通场所使用。基于NEC的要求见本文件附件dva。

Programmable Controllers - Part 2: Equipment Requirements and TestsUL 61131-21.1 Scope and objectThis Part of IEC 61131 specifies requirements and related tests for programmable controllers (PLC) and their associated peripherals (for example, programming and debugging tools (PADTs), human-machine interfaces (HMIs), etc.) which have as their intended use the control and command of machines and industrial processes.PLCs and their associated peripherals are intended to be used in an industrial environment and may be provided as open or enclosed equipment. If a PLC or its associated peripherals are intended for use in other environments, then the specific requirements, standards and installation practices for those other environments must be additionally applied to the PLC and its associated peripherals.This standard also applies to any products performing the function of PLCs and/or their associated peripherals.Equipment covered in this standard is intended for use in overvoltage category II ( IEC 60664-1) in low-voltage installations, where the rated mains supply voltage does not exceed a.c. 1 000 V r.m.s. (50/60 Hz), or d.c. 1 500 V. (If PLCs or their associated peripherals are applied in overvoltage category III installations, then additional analysis will be required to determine the suitability of the equipment for those applications.)1.1DV Modification to Paragraph 4 of 1.1:Equipment operating at more than 600 V is considered as high voltage equipment with respect to the requirements in the National Electrical Code.This standard does not deal with the functional safety or other aspects of the overall automated system. PLCs, their application programme and their associated peripherals are considered as components of a control system.Since PLCs are component devices, safety considerations for the overall automated system including installation and application are beyond the scope of this standard. However, PLC safety as related to electric shock and fire hazards, electrical interference immunity and error detecting of the PLC-system operation (such as the use of parity checking, self-testing diagnostics, etc.), are addressed. Refer to IEC 60364 or applicable national/local regulations for electrical installation and guidelines.The object of this standard is- to establish the definitions and identify the principal characteristics relevant to the selection and application of PLCs and their associated peripherals;- to specify the minimum requirements for functional, electrical, mechanical, environmental and construction characteristics, service conditions, safety, EMC, user programming and tests applicable to PLCs and the associated peripherals.This Part also specifiesa) service, storage and transportation requirements for PLCs and their associated peripherals (Clause 4);b) functional requirements for PLCs and their associated peripherals (Clause 5);c) EMC requirements for PLCs and their associated peripherals (Clause 8);d) safety requirements for PLCs and their associated peripherals (Clause 11);e) information that the manufacturer is required to supply (Clauses 7, 10 and 14);f) test methods and procedures that are to be used for the verification of compliance of PLCs and their associated peripherals with the requirements (Clauses 6, 9, and 12).The tests are type tests or production routine tests, and not tests related to the ways PLC systems are applied. 1.101DV Addition of the following to 1.1:This equipment is intended for installation in accordance with the National Electrical Code (NEC) for use in ordinary locations. Requirements based on the NEC are found in Annex dva of this document.